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H. A. DAVIS.

TERRY WAHP LET-OFF. APPucATLoN mab ocT. 1, 191s.

Patented Nov. 25, 1919.,

3 SHEETS-SHEET l.

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H. A. DAVIS.

TERRY WARP LET-OFF.

APPucATmN man 0cT.1,19\a.

Patented Nov. 25, 1919.

3 SHEETS-SHEET 2.

Z711] @71190 7? gah H. A. DAVIS.

TERRY WARP LET-OFF.

APPLICATION FILED OCT. 7, 1918.

1,322,671 -v Patented Nov. 25, 1919.

3 SHEETS-SHEET 3.

i y I y 1 l raven/2907." f6 HvyiaZ/ of the terry warp HARRY A. DAVIS, 0F HOPEDALE,

MASSACHUSETTS, ASSIGIN'OBI TO DRAPER CORPORA- TION, OF HOPEDALE, MASSACHSETTS, A CORPORATION OF MAINE.

TERRY-WARE LET-OFF. 0

`is done, the positive action of the let-o should be discontinued.

The present invention consists of an 1mroved let-off mechanism for this purpose.

The improvements are illustrated in the accompanying drawings in whieh- Figure 1, is a vertical longitudinal section of a loom equipped with the present 1mprovements. Fig. 2, is a plan view of the terry beat-up motion. Fig. 3, is a plan view let-off. Fig. 4, is a section in the plane indicated by the line 4 4 in Fig. 3. Fig. 5,l is a section inthe plane indicated by the is a section in the plane indicated by the line The terry warp threads proceed from the terry beam 10, partly around an idle roll 11, thence nearly completely around a terry let-off roll 12, as indicated in Fig. 5, and thence around an idle roll 13. From thence warp stop motion detectors 14, the'harnesses 15and the reed 16, to the take-up lroll 17, .and the cloth beam 18. yThe ground warp threads proceed from the ground warp beam V 19, over the whip roll 20, and thence through the detectors, the harnesses and the reed to @the take-up roll and the cloth beam. v The leto roll 12, as shown in Fig. 4, has la, roughened.surface which may be of sandV .fpapferjfor"of'1roughened metal. Rigid with .the-le fwth P ,Connectedljtofthe pinion is aratchet wheel .24, withwhicli cooperates a pawl k25. This pawllisfpivotedfto a pivoted paw leyer 26, f

roll .is'` a gear l21,.-which meshes 1ni'onj22, turning on a fixed stud 23.

(Figs. `llsgafnd 5)f, and1it s'point' ist l tained in engagementwit'h thejvratchet wheel'by a spring 2.7.', Connected tothe lowerend of the pawllglever`26, is a rod28, which at its line 5 5 in Fig. 3. Fig. 6,.

Specification of Letters Patent. Patentgd Nov, 25, 1919. l Application filed October 7, 1918. 'Serial No. 257,168.

This Shaft A, is rocked during the terry4 weaving for each full forward beat of the ree-d; Ibut it is n ot rocked during the partial forward beats of the reed nor during the plain weaving. This shaft A, may be rocked in the manner described either by the mechanism of United States Letters Patent of Bardsley No. 937,139, October 19,V 1909, or by the means disclosed in the pending applie-ation for Letters Patent of the United States of Charles F. Merrill, Serial Number 250,043, filed August 15, 1918.

When the shaft A, is rocked in producing ther full forward beat of the reed during terry weaving the upper end of the crank arm 29, moves forwardly thereby moving the pawl 25, rearwardly and positively rotating thelet-oif roll 12, in the proper direction to feed the. terry warp threads intermittently and forwardly and to the extent required to produce the terry loops. Y

During the partial forward strokes of the reed during terry weaving land also yduring the full forward strokes of the reed during plain ;weaving, the terryy warp threads'are fed forwardly by the take-up action of the take-up roll. During this action the ratchet wheel 24, rides freely under the pawl 25, and the let-off roll 12, and the terry warp beam 1 0, rotate and the positive action of the terry let-,off does not` occur.

the terry warp threads pass through, usual Itis desirablethat the let-off beam should notoverrun. Accordingly friction is maintained upon it by the band 30, extending around the drum on the warp beam.' The tension of this band is adjustable by means of the thumb nut 31, and spring 32.

It is also desirable that thereshould be at all times frictional resistance tothe free turning of the let-offl roll 12.' Forthisfpurpose a drum 33, is fixed tothe ratchet 25. Coperating with this drum are two, fric-v tiony shoes 34, of leather or felt ycarried rei i spectively by levers 35, and 36, loosely pivoted upon the fixed stud 34. Adjustable pressure 1s given to the shoes by means of the hand controlled lever 38, pivoted to aY rod 39, surrounded by a spring 40, at its lower end, the tension of which can be adjusted by means of a nut 41. This spring bears on the lower vlever 35. The lever 38, has a cam 47, which-bearson the upper lever shown in Fig. 4, the upper bearing 43, is

for every full beat-up stroke of the reed,

pivoted and is held in place by a thumb nut 44, screwing upon the upper end of a pivoted rod 45. This rod 45, extends between spaced lugs 46, on the upper bearing 43. By releasing the thumb nut 44, the rod 45, can be swung outwardly and away from the lugs 46. Thereupon the bearing 48, can be swung forwardly out of the way and the let-off roll can be removed.

Suiicient of the mechanism of the aforesaid Merrill application is here illustrated to enable the rocking of the beat-up motion .shaft A, to be understood. During the terry weave the shaft A, is rocked -by a cam B, on the back shaft C. This shaft, as common in terry looms, is geared to the cam shaft of the loom so as to run continuously and so that the desired speed ratio issecured to correspond with the number of picks for each full forward beat of the reed. This ratio may be any desired. A common ratio is such that the reed moves partly forward for two picks and then beats'up to its full extent following the third pick.

A cam lever Dat its frontend is loosely hung on the rock shaft and at its rear end has a roll a, traveling in 'the groove of cam C. The lever D,-is adapted to be coupled' and uncoupled from the shaft A.' During the terry weave it remains coupled to the shaft A, and hence the shaft is rocked back fand forth at every revolution of the cam.

The cam is so shaped that the shaft is rocked in the illustrated instance at every third eforward beat of the lay.

In order to do plam weaving the cam lever D, is uncoupled from the shaft A. When thus uncoupled the cam lever at its forward end simply turns idly on the shaft A, and the shaft is maintained in such position that the reed at every forward beat makes its full stroke. FastV on the beat-up motion shaft is a crank arm E, having a slot b. A latch F, is pivoted t-o the main lever. Its latching tooth 0, always occupies a slot ai, in the cam lever. The latch is swung in one direction by a spring G. When this spring is free to act it projects the latch tooth into the slot b, in the arm E, thereby locking the cam lever to the arm so that said shaft is then under the control of the cam. In order to stop the cam actuation of the shaft it is simply necessary to withdraw the latch from the slot in the .arm E, by moving the latch against the stress of the spring G. As shown in Fig. 2, of the drawings the latch is connected by a link I, with a lever J, pivoted at its middle upon the shaft A. A wire K, extends from the lever J, to the pattern mechanism, as set forth in said Merrill application, s'o that the coupling and uncoupling of the cam leverA to the shaft A, is automatically effected. s

Accordingly, the shaft A, is not rocked during plain weaving. Hence, since the pawl 25, is actuated from the shaft A, the positive terry warp let-olf does not act during plain weaving. During plain weaving as well as during the partial forward beats of the reed occurring during terry weaving, the friction let-off for the terry warp is effective.

The present invention thus provides a combined intermittently active positive and constantly acting friction let-off for the terry warps. This combination let-off is effective at the full forward stroke beat of the reed in forming the terry loops. At each partial forward beat of the reed during the terry weave and also during the entire plain weave the positive let-ofi' is idle but the friction let-off is effective.

The shaft A, as described in said Merrill application, is held in place during plain weaving by a spring H, and by an adjustable stop L, carried by the shaft A, abutting against a fixed girt L. v

The drum 33, might be connected directly to the let-off roll instead of indirectly through the ratchet, pinion and gear. The important relation is that the drum should be operatively connected to the let-ofil roll.

l. A terry loom having a reed, a terry warp beam, a rough surfaced let-off roll, a roll around which the terry warp threads pass between said beam and let-off roll, a

second roll around which the terry warp threads pass between said let-o3 rll and the reed, a gear on the let-off, a pinion meshing with said gear, a ratchet wheel connected to said pinion, a friction drum operarotating cam, connections between said shaftv and cam for rocking said shaft intermits tently to effect the full forward beat-up movement of the reed, a pawl lever having a pawl engaging said ratchet wheel, and connections between said beat-up motion shaft and pawl lever so that'said let-off roll is rotated positively to feed the terry warp at each full forward movement of the reed during terry weaving.

2. A terry loom having a reed, a terry warp beam, a let-offl roll, a gear on the letoif roll, a pinion meshing with said gear, a ratchet wheel connected to said pinion, -a friction drum operatively connected to the let-off roll, and adjustable friction shoes bearing continuously and yieldingly on said drum, in combination with a beat-up motion shaft, a continuously rotating cam, connections between said shaft and cam for rocking said shaft intermittently to effect the full forward beat-up movement of the reed, a pawl 'lever having a pawl engaging said ratchet wheel, and adjustable connections between said beat-up motion shaft and pawl lever so that said let-off roll is rotated positively to feed the terry warp at each full forward movement of the reed during terry weaving.

43. A terry loom having a reed, a terry warp beam, a rough surfaced let-off roll, a gear on the let-ofil roll, a pinion meshing with said gear, a ratchet wheel connected to said pinion, a friction drum operatively connected to the let-offI roll, and means frictionally engaging said drum, in combination with a beat-up motion shaft, a continuously rotating cam, connections between said shaft and cam for rocking said shaft intermittently to effect the full forward beatup movement of the reed, a pawl lever having a pawl engaging said ratchet wheel, and connections between said beat-up motion shaft and pawl lever so that said let-off roll is rotated positively to feed the terry warp at each full forward movement of tlr reed during terry weaving.

4. A terry loom having a reed, a terry warp beam, a let-off roll, a gear on the letoff roll, a pinion meshing with said gear, a ratchet wheel connected to said pinion, a friction drum operatively connected to the let-off roll, and means frictionally engaging said drum, in combination with a beatup motion shaft, a pawl lever having a pawl engaging Said ratchet wheel, and connections between said beat-up motion shaft-and pawl lever so that said let-o roll is rotated positively to feed the terry warp at each full forward movement of the reed during terry weaving,

5. A terry loom having a reed, a terry warp beam, a rough surfaced let-off roll, a gear on the let-off roll, a pinion meshing with said gear, and a ratchet wheel connected to said pinion, in combination with a beat-up motion shaft, a continuously rotating cam, connections between said shaft and cam for rocking sai-d shaft intermittently to effect the full forward beat-up movement of thereed, a pawl lever having a pawl engaging said ratchet wheel, and connections between said beat-up motion shaft and pawl lever so that said let-off roll is rotated positively to feed the terry warp at each full forward movement of the reed during terry weaving.

6; `A terry loom having an intermittently acting positive let-off and a constantly acting adjustable friction let-offl for the terry warp, in combination with an actuator for the positive let-off which acts only on the full forward beat-up movements of the reed during the terry weave.

7. A terry loom having an intermittently acting positive let-off and a constantly acting friction let-off for the terry warp, in combination with an actuator for the positive let-off which actsgonly on the full forward beat-up movements of the reed during the terry weave.

In witness whereof, I have hereunto signed my name'.

HARRY A. DAVIS. 

